用核磁共振技术测量低渗含水气藏中的束缚水饱和度

Measurement research on irreducible water saturation in low-permeability water-cut gas reservoirs using NMR techniques

杨正明 姜汉桥 周荣学 朱光亚 刘学伟

YANG Zhengming JIANG Hanqiao ZHOU Rongxue ZHU Guangya LIU Xuewei

中国科学院渗流流体力学研究所，河北廊坊065007 中国石油大学，北京102249 华北油田公司，河北任丘062552

Institute of Porous Flow & Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China China University of Petroleum,Beijing 102249,China

低渗含水气藏的探明储量越来越多，急需开发。这类气藏具有低孔隙度、低渗透率和高含水饱和度等特点。鉴于当前测试束缚水饱和度方法存在较多问题，利用核磁共振技术研究了苏里格低渗气藏的束缚水饱和度及其在不同气驱条件下岩心的束缚水饱和度的变化情况。研究结果表明：渗透率与束缚水饱和度有很好的相关关系，渗透率越低，其束缚水饱和度越高，含气饱和度也越低，可以用束缚水饱和度来表征低渗气藏开发潜力特征；在不同的气驱水过程中，其束缚水饱和度是变化的。该研究成果为低渗含水气藏的储量计算和合理高效开发提供科学的决策依据。

More and more reserves are discovered in low-permeability gas reservoirs and they urgently need to be developed. The reservoirs feature in low porosity, low permeability, and high water saturation. The NMR technique is used to probe into the irreducible water saturation of low-permeability gas reservoirs in Sulige Oilfield and the change of core irreducible water saturation under different gas flooding conditions. Research results show that the permeability has a high correlation with the irreducible water saturation. The lower the permeability is, the higher irreducible water saturation gets. The gas saturation gets lower too. So the irreducible water saturation can be used to indicate the potential of low-permeability gas reservoir development. The irreducible water saturation varies in different process of gas drive. The result provides scientific basis for the calculation of reserves in low-permeability water-cut gas reservoirs and the rational high-efficiency development of them.